fix: pydantic beta versions compatibility added.

[dapper91]

Pydantic beta versions compatibility added. Current implementation doesn't recognize alpha/beta versions like 2.13.0b1.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.19%. Comparing base (cd103e7) to head (05358d5).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
pydantic_xml/compat.py	90.90%	1 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #322      +/-   ##
==========================================
- Coverage   92.20%   92.19%   -0.02%     
==========================================
  Files          31       31              
  Lines        1771     1781      +10     
==========================================
+ Hits         1633     1642       +9     
- Misses        138      139       +1     

Flag	Coverage Δ
unittests	92.19% <90.90%> (-0.02%)	⬇️

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